Jet does not need valid IR ( even though the ad says otherwise ) . The ad has been the exact same since 2011 and has no changes to it .
If you read this pprune thread from the beginning you can see that this has been discussed for TFO 2011 , 2013 and 2014. The ad always says valid IR but Jet has never required your IR to be valid ( no airline in India does unless maybe its a type rated vacancy )